Apparatus for granulating slag.



I. G HOFFMAN.

APPARATUS FOR GRANULATING SLAG.

APPLICATION FILED JUNE 26, 1907.

902,490, Patented Oct. 27, 1908.

ED STATES IATENT orrroa:

ISAAC HOFFMAN, OF SOUTH CHICAGO, ILLINOIS.

APPARATUS FOR GRANULATING SLA G.

Specification of Letters Patent.

Patented Oct. 27, 1908.

I Application filed June 26, 1907. Serial No. 380,980.

' front or receiving end of the same; Fig. 3 is a longitudinalcross-section on the line III- III of Fig. 1; and Fig. 4 is an endelevation 'of'the discharging end of the apparatus.

My invention relates to apparatus used in handling moltenslag as it isdischarged from the slag tapping hole of a blast furnace and it isdesigned to provide a simple and effective apparatus by the use of whichthe expense of handling the slag is greatly reduced and the diflicultiesand dangers heretofore .met with are avoided and prevented.

Heretofore in apparatus employed for granulatlng slag, the slag has beenrun 1nt0 a large tank or pool of water or the slag has been brought intocontact with water within an inclosing chamber or tube. The first ofthese devices necessitates handling in removing the slag from the tankto the cars for shipment, while the use of the inclosed chamher or tuberesults in frequent explosions. with great liability of damage tosurrounding property, expensive delays and possible injury and loss oflife to the operatives. In order to overcome these difliculties and dan;gers I employ an open metal trough in which the molten slag is broughtinto contact with water so as to effectually granulate it. Preferablythe section oftrough in which the water is introduced, islocated so asto project over a track so as to deliver the granulated slag into a caror cars which-are placed in position on the track. Instead of thisarrangement, the trough section containing the water supply outlet maybe located at any desired point in the length of the slag runner.

In the drawings 2 represents the'preferred form of construction of theslag trough. The bottom of the inside of the trough is provided with astep or offset 3 at about the middle of its length and a water outlet 4which is preferably a narrow slot opens into'thetrough 2 through thevertical wall formed by this. step or offset. The slot 4 is connected bythe channel or conduit 5 with a suitably shapedoutlet opening 6, thisoutlet being connected by a suitable pipe and flange to a source ofwater supply. Provision for securing the trough to the next section ismade by means of suitable lugs or ears 7. V

In the operation of the apparatus, the water is turned on and flows'down the trough under considerable pressure from .the water outletslot. The molten slag is then caused to flow down the slag runner and asit flows over the offset 3 comes into contact with the water. The slagis instantly disintegrated and formed into a fine sharp sand which canbe used as a substitute for ordinary river or'pit sand for buildingpurposes, without further. treatment. The

disintegrated slag is washeddown the slag troughby the water and isdischarged from the trough directly into cars in'a cool condition and isthen ready for shipment.

The advantages of my invention will be apparent to those skilled in theart. The

danger of explosions and consequent dam-- age to surrounding property isentirely removed, one handling operation of the slag.

is rendered unnecessary resulting in less exfpense in disposing, of themolten slag. The slag is disintegrated into a fine sharp sand which iseasily disposed of as it is in condition to be used for various purposeswithout further treatment.

The apparatus is simple and not liable to get out of order.

Many changes in the form and arrangement of the trough may be madewithout departing from my invention.

I claim 1. Apparatus for granulating molten slag comprising an openmetal trough having its bottom surface in two substantially parallelplanes with a step or off-set intermediate of its ends, and a watersupply channel located .in the bottom of said trough and having itsdischarge end terminating in a vertical wall forming the step orofi'-set, the supply chani ne being flattened to-form a dischargeopening 'wide in one dimension and relatively thin transversely;substantially-as described.

2. Apparatus for granulating molten slag comprising an open metal troughhaving its bottom-surface in two substantially parallel planes'with astep. or off-set intermediate of its ends, and a water supply channellocated in the bottom of said trough and having its discharge endterminating in a vertical wall forming the step or off-set, the supplychaniiel being flattened to form a discharge open ing in one dimensionand relatively thin transversely, the bottom wall ofthe flatteneddischarge opening being in the same, horizontal plane as the bottom ofthe dis charge end of the trough; substantially as described.

3. Apparatus for granulating molten slag comprising an open metal troughhaving upwardly and outwardly inclined sides connected by a curvedbottom portion, the bottom surface of the trough being in twosubstantially parallel planes with a step or offset intermediate itsends and with a water supply channel in the trough having its dischargeend terminating in a vertical wall. .forming the step or ofi-set, thesupply channel being flattened to form a discharge openin wide in onedimension and relatively thin transversely, the bottom of the flatteneddischarge opening being in the same curved plane asthe bottom of thedischarge end of the trough; substantially as described.

In testimony whereof, I have hereunto set my hand.

